Quartz
SiO2 (Silicon Dioxide)
mineral
Category
Sedimentary (Artificial)
Browse sedimentary (artificial) specimens identified by the Rock Identifier community.
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Galena
Lead Sulfide (PbS)
mineral
Chalcedony (Common Opal variant or Agate pebble)
Silicon dioxide (SiO2)
mineral
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Tiger's Eye, Hematite, and Black Obsidian Bracelet
SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)
mineral
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Jasper
Silicon dioxide (SiO2) with iron inclusions
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Menilite Opal (Goddess Stone)
Menilite Opalescent Silex (Amorphous Hydrated Silica)
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Gypsum (Alabaster variety)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Yellow Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Banded Calcite (often sold as Caribbean Calcite or Honey Calcite)
Calcium Carbonate (CaCO3)
mineral
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Coal
Anthracite or Bituminous Coal (Carbon)
sedimentary
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Chert (White Chert or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Banded iron formation (ironstone)
BIF; hematite–magnetite–quartz/chert assemblage
sedimentary
Weathered basalt or iron-rich volcanic rock
Mafic volcanic rock, likely basalt; exact identification requires testing
igneous
Chert
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (SiO2-rich clastic sedimentary rock)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Coal
Anthracite / Bituminous Coal
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Lithic Sandstone / Greywacke)
Sandstone (SiO2 rich clastic sedimentary rock)
sedimentary
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Sandstone River Cobble
Arenite (SiO2 based)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary